Tbh I would rather browse flickr or dpreview when that was a thing than to jump on instagram. Never been on it - but seeing the stuff an ex would post and others I always found it offputting. I am sure it had good pictures on it at one point, but that was so long ago I never had an opportunity to experience it. I assume it was good before facebook bought them.
Sorry but Fritos of software is dumb & in no way representative of bringing old chromebooks back to life beyond their support date.
Schools often buy the bottom baseline of everything & in now way was a 4gb of ram a good, decent or proper experience to begin w/ & their replacements probably also had 4gb of ram - just a faster cpu, gpu & ram to hide that it’s lacking ram still.
I think schools could easily band together & make their own education focused Linux distro & then just focus on hardware that’s compatible w/ that’s Chromebooks or Windows laptops. Hard part would be building out an on par MDM &/or ldap server if not using a Windows server.
All Chromebook are is a browser basically. It already is the bag of Fritos imho. I think the hard part though would be to hire an IT guy that knows Linux better than the students tbh. Schools already under pay teachers in the US & that goes 2-3x for IT staff.